Evaluation of microstructure and mechanical properties of Al/Al2O3/SiC hybrid composite fabricated by accumulative roll bonding process
Evaluation of microstructure and mechanical properties of Al/Al2O3/SiC hybrid composite fabricated by accumulative roll bonding process
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DOI：
10.1016/j.matdes.2013.06.064
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发表时间：
2014-01-01
影响因子：
8.4
通讯作者：
Najafizadeh, Abbas
中科院分区：
文献类型：
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作者：
Ahmadi, Azin;Toroghinejad, Mohammad Reza;Najafizadeh, Abbas
本研究首次采用阳极氧化-累积叠轧焊（ARB）工艺制备了一种以纯铝为基体、Al 2 O3和SiC颗粒混杂增强的新型金属基复合材料。研究了ARB工艺不同阶段复合材料的显微组织和相应的力学性能。结果发现，随着ARB循环次数的增加，氧化铝层断裂，导致Al 2 O3颗粒在铝基体中均匀分布。改善了SiC颗粒的分布，降低了颗粒与基体之间的孔隙率。观察到复合材料的拉伸强度通过增加ARB道次而改善，即Al/1.6体积%的复合材料的拉伸强度Al 2 O3/1体积% SiC复合材料被测量为比所接收的材料高约3.1倍。此外，复合材料的抗拉强度下降，增加SiC颗粒的体积分数超过1体积%。断口的扫描电镜观察表明，混杂复合材料的断裂机制为剪切韧性断裂。(C)2013爱思唯尔有限公司保留所有权利。
In this investigation, a new kind of metal matrix composites with a matrix of pure aluminum and hybrid reinforcement of Al2O3 and SiC particles was fabricated for the first time by anodizing followed by eight cycles accumulative roll bonding (ARB). The resulting microstructures and the corresponding mechanical properties of composites within different stages of ARB process were studied. It was found that with increasing the ARB cycles, alumina layers were fractured, resulting in homogenous distribution of Al2O3 particles in the aluminum matrix. Also, the distribution of SiC particles was improved and the porosity between particles and the matrix was decreased. It was observed that the tensile strength of composites improved by increasing the ARB passes, i.e. the tensile strength of the Al/1.6 vol.% Al2O3/1 vol.% SiC composite was measured to be about 3.1 times higher than as received material. In addition, tensile strength of composites decreased by increasing volume fraction of SiC particles to more than 1 vol.%. Scanning electron microscopy (SEM) observation of fractured surfaces showed that the failure mechanism of broken hybrid composite was shear ductile rupture. (C) 2013 Elsevier Ltd. All rights reserved.